Resolved: foreign key constraint
trying to add foreign key constraint but always giving
21:53:13 alter table sales add foreign key (customer_id) references customers (customer_id) on delete cascade Error Code: 1822. Failed to add the foreign key constraint. Missing index for constraint 'sales_ibfk_1' in the referenced table 'customers' 0.000 sec
1 answers ( 1 marked as helpful)
Hi Yasmine!
Thanks for reaching out.
This could mean that the customers table does not have a primary key. You should make this column a primary key and only afterwards you will be able to create a foreign key which references it.
Hope this helps.
Best,
Tsvetelin
